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首页> 外文期刊>Journal of Applied Polymer Science >Studies on the Cure Kinetics and Networks Properties of Neat and Polydimethylsioxane Modified Tetrafunctional Epoxy Resins
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Studies on the Cure Kinetics and Networks Properties of Neat and Polydimethylsioxane Modified Tetrafunctional Epoxy Resins

机译：净和聚二甲基硅氧烷改性四官能环氧树脂的固化动力学和网络性质的研究

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摘要

The cure kinetics of tetrafunctional epoxy resins with three different backbone structures and their modification by polydimethylsioxane (PDMS) were studied by means of differential scanning calorimetry with dynamic approach. The development of epoxy networks was characterized by dynamic viscoelastic measurements. Results showed that all the epoxy resins obeyed the autocatalytic reaction mechanism with a reaction order of about 3. Epoxy resin with softer aliphatic backbone demonstrated a higher cure reactivity and stronger tendency towards autocatalysis, as well as lower crosslinking density. The PDMS-modified epoxy resins showed higher early cure reactivity and a lower crosslinking density due to the plasticization and restriction effect of the dispersed PDMS phase, respectively. Based on cure kinetics and dynamic viscoelastic results, the alpha(m) was found to be an effective precursor for describing the developing of epoxy networks during the course of cure.
机译：通过差示扫描量热法和动力学方法研究了具有三种不同骨架结构的四官能团环氧树脂的固化动力学及其经聚二甲基硅氧烷（PDMS）的改性。环氧网络的发展以动态粘弹性测量为特征。结果表明，所有环氧树脂都遵循自催化反应机理，反应顺序约为3。脂族骨架较软的环氧树脂表现出更高的固化反应性和更强的自催化趋势，以及更低的交联密度。由于分散的PDMS相的增塑作用和限制作用，PDMS改性的环氧树脂分别显示出较高的早期固化反应性和较低的交联密度。基于固化动力学和动态粘弹性结果，发现α（m）是描述固化过程中环氧网络发展的有效前体。

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